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Spherical haydite matrix for constructed wetland and its preparation method

A technology for constructed wetlands and substrates, applied in chemical instruments and methods, clay products, and other household appliances, etc., can solve the problems of difficulty in maintaining long-lasting continuous operation of the constructed wetland treatment system, low phosphorus removal capacity, clogging, etc., and achieve good environmental benefits. and social benefits, saving economic costs, increasing the effect of contact area

Inactive Publication Date: 2012-06-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
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  • Application Information

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Problems solved by technology

However, existing wetland substrates generally have relatively low removal capacity for nitrogen and phosphorus, serious clogging problems, and it is difficult to maintain the long-lasting and continuous operation of the constructed wetland treatment system.

Method used

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  • Spherical haydite matrix for constructed wetland and its preparation method
  • Spherical haydite matrix for constructed wetland and its preparation method
  • Spherical haydite matrix for constructed wetland and its preparation method

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Embodiment Construction

[0024] In the research on the preparation method of the constructed wetland matrix, the inventors carried out the following test process, so as to determine the optimal control parameters in the matrix preparation method.

[0025] (1) Select raw materials and make ceramsite

[0026] The applicant has found through research that the terminal coagulated sludge of the water supply plant will form many micro-pores after firing, and this structure has a strong ability to adsorb and remove pollutants. At the same time, there are a large amount of coagulant residues such as aluminum and iron in the terminal coagulation sludge, which has good precipitation and removal performance for phosphate in sewage; therefore, the terminal coagulation sludge of the water supply plant is selected as the raw material of the matrix. The sludge in this experiment was taken from the terminal sludge of Qujiang Water Plant in Xi'an City. The agent added to the coagulation and sedimentation process of th...

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Abstract

The invention discloses a preparation method of spherical haydite matrix for constructed wetland, which comprises removing impurity and particles in coagulated sludge at the terminal of a water supply plant to give sludge paste; completely mixing kaolin with the treated sludge, regulating the water content of the sludge to 60-65%, and preparing spherical haydite with particle size of 15-18 mm and25-28 mm by using the sludge, wherein per 1 kg of dry sludge is mixed with 0.60-0.70 kg of kaolin; and preheating at 200 DEG C for 1h, and sintering at 600-700 DEG C for 120-150min to obtain the final product with particle size of 8-10mm and 15-18mm. It is proved by the experiment that the matrix prepared by the method can remove COD (chemical oxygen demand), ammonium nitrogen and total phosphorus in wastewater effectively without matrix plugging, and is suitable for treatment of domestic wastewater, industrial and agricultural wastewater and polluted surface water. The treated wastewater reaches the first-level A standard of discharge standard of wastewater for municipal wastewater treatment plant.

Description

technical field [0001] The invention belongs to the technical field of water pollution control engineering sewage treatment, and in particular relates to an artificial wet-global ceramsite matrix and a preparation method thereof. Background technique [0002] Constructed wetland is a high-efficiency ecological water purification technology, which has strong nitrogen and phosphorus treatment capacity and can be operated for a long time. The benefit is remarkable, and the sewage resource can be realized. It is suitable for the treatment of municipal sewage, industrial and agricultural wastewater and the restoration of polluted water bodies. The treated water can be directly reused or discharged into landscape water bodies, reservoirs, rivers or lakes. Based on the above advantages, more and more attention has been paid to the constructed wetland technology, and it has been widely promoted and applied in various countries. [0003] Substrate is an important part of constructe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C02F3/32C02F3/34
CPCY02P40/60
Inventor 王文东周礼川王洪平刘海楠卜龙利
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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